does anyone know the max voltage they can take cheers

My 3PK doesn't have any prob withthea fully charged 12.6v of a 3S lipo. Been using one for over 2yrs.

Same here.

reason for asking i have some li.soci2 cells are size aa and 2500 mah the problem is they are 3.6v each cell so to put 8 of them in a 3pk might be a little silly but i tested them in an acoms 2.4 controller it worked fine but hummed not sure if it did before any way i want to put them to good use but am too scared to fry my 3pk any other suggestions what i can use them for seems a shame to waste

Wow, 8 of those would be 28.8v! I bet it hummed, lol! You're lucky you didn't fry it!

Don't see any way its safe to use those in a 3PK, 3 cells would be too few )(low voltage) and 4 is too much voltage again - even if you wanted to wire them special.

i have found a use for those cells my electric toothbrush i have the cleanest teeth in hertfordshire

just connect 3 in series to get 10.8V 2500mah battery pack... or get creative and connect six in a 3S 3P to get 10.8V 5000mah pack ... 10.8V is close to the stock 9.6V pack the 3pk comes with so it will be able to handle it without any problems.

imagine a 5000mah tx pack... you'll only need to charge once a year!!

Protec 3300's are good for 18+ hours.